- nRF51: Use `uart_conf_t` for consistency with nRF52
- nRF52832: Use UARTE (UART with EasyDMA) over UART (without DMA), as
done for all other nRF52 family members
- use `UARTE_PRESENT` to detect whether an UARTE can be used, rather
than family names
The lis2dh12 interrupt pin defines at some point got renamed
LIS2DH12_PARAM_INT1 -> LIS2DH12_PARAM_INT_PIN1
but this board was missed out.
This fixes the omission.
There are no more references to `LIS2DH12_PARAM_INT1` in the code.
